# Challenges

- [List of challenges](/backend/challenges/list-of-challenges.md)
- [Challenge details](/backend/challenges/challenge-details.md)
- [Registered users](/backend/challenges/registered-users.md)
- [Challenge ranking](/backend/challenges/challenge-ranking.md)
- [Users' progress](/backend/challenges/users-progress.md)
- [Definitions](/backend/challenges/definitions.md)